For upper elementary school students! A lively and educational true-or-false quiz

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Ordinary liquids shrink in volume as their temperature drops, but water is a bit special. Water’s volume decreases as it cools down to 4°C, but if it gets colder than that, its volume actually increases. That’s why ice floats on water.

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Bees collect nectar not only for themselves but also for their colony. By bringing the nectar back to the hive, it becomes food for their nestmates and larvae. In addition, as they fly from flower to flower gathering nectar and pollen, they help pollinate plants.

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Deserts receive little rain and are dry, but that doesn’t mean there’s no water at all. There are oases where water accumulates underground, and some plants and animals contain moisture. Cacti have stems that store water instead of leaves, and desert animals survive without wasting the water in their bodies.

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The speed of electric flow varies depending on the material, but it doesn’t reach the speed of light (about 300,000 km/s). In other words, the flow of electricity is fast, but it’s a bit slower than light speed. Both happen in a realm so fast that they’re invisible to the human eye.

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Dolphins may look like fish, but they are actually mammals, just like humans. They breathe air with their lungs, give birth to live young instead of laying eggs, and mothers raise their babies with milk.

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Some species of pufferfish contain a potent toxin called tetrodotoxin. It is especially concentrated in the liver and ovaries, and consuming it can be life-threatening. Therefore, when pufferfish is prepared for eating, it is handled carefully by chefs with specialized licenses.

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The first train invented in Japan was not the Shinkansen. The Shinkansen is a high-speed railway that began operating in 1964, but Japan’s first electric train was the “electric railway” of the Meiji era, which began running in Kyoto in 1895.